Nightshade is a superhero appearing in media published by DC Comics. Created by David Kaler and Steve Ditko, the character first appeared in Captain Atom #82 originally published by Charlton Comics.
Nightshade in Deathstroke #33.
Captain Atom is the name of several superheroes appearing in American comic books, initially owned by Charlton Comics before being acquired in the 1980s by DC Comics. All possess some form of energy-manipulating abilities.
Cover for Captain Atom vol. 3 #1, art by Pat Broderick.
Strange Suspense Stories #75 (June 1965), a reprint issue of Captain Atom's debut, cover art by Steve Ditko.